9:1 compression + high boost

[IJ.]

one thing not mentioned is that higher compression helps spool-up

It makes for a very responsive snappy motor but leaves NO ROOM for error 1 tank of crap gas WILL ruin your day if you don't have a strategy in place to deal with detonation.

Just not worth the risk for me.

It wasn't?

 

[MRSUPRA]

Another thing not mentioned since we are going over un-mentioned things: Most new turbocharged cars use a much higher compression in there engines. The reason: Again, drivability. And of course better technology like Direct injection for better cylinder cooling allows a lower detanation threshhold.

 

[NeatOman]

Also the smaller the engine (cylinder with, sorry forgot how to speel the other with) normally is more forgiving towards detonation it is.

 

[Doward]

Actually, with a smaller bore (not necessarily the engine) and the same style combustion chambers, you'll have less chance of detonating with the smaller bore - the quicker you get the flame front propagated, the less chance of you having combustion where you don't want it

 

[gilberjj]

there is a local dsm running (que drum roll) 30 psi on pump gas w/out meth. I kid you not. he ran an 11.1 in steet form. kinda cool i thought.

 

[zbaVR4]

It wasn't?

'responsive' and 'snappy' might not be as clear and concise, for others, as you might think it is. I could say my lawn mower was responsive and snappy but that doesn't describe if its turbo'd

 

[NeatOman]

Actually, with a smaller bore (not necessarily the engine) and the same style combustion chambers, you'll have less chance of detonating with the smaller bore - the quicker you get the flame front propagated, the less chance of you having combustion where you don't want it

U says it smrt :love:

Thats what i was trying to communicate.

there is a local dsm running (que drum roll) 30 psi on pump gas w/out meth. I kid you not. he ran an 11.1 in steet form. kinda cool i thought.

Also... 30psi! WTF... stock flow! LOL

 

[Nick M]

Pretty good thread, as long as you let the good info sink in.

 

[Doward]

Breath in the good info, breath out the bad info

 

[quake]

Another thing not mentioned is the you can make more power on pump gas with lower compression. What kind of gas are you going to run 99% of the time?

yeah your right. So i bumped the compression down a bit to 8:4:1, pulled the 71mm and put the ct back on for the mean time now looking for a 67.

 

[upgradedsupra]

yeah your right. So i bumped the compression down a bit to 8:4:1, pulled the 71mm and put the ct back on for the mean time now looking for a 67.

Geez....not done yet?













































:biglaugh:

 

[quake]

Geez....not done yet?

not fully but i drive it every day. Ended up with 400rwtq keep a lookout in your rear view. lol:biglaugh:











































:biglaugh:

 

[upgradedsupra]

LOL the only person in the rear view will be you :biglaugh: The only way I would be in the rear view is if I already had hit the brakes and you did the ricer fly bye LOL

 

[quake]

LOL the only person in the rear view will be you :biglaugh: The only way I would be in the rear view is if I already had hit the brakes and you did the ricer fly bye LOL

lol

 

[upgradedsupra]

lol

So any updates?

 

[quake]

So any updates?

not yet been lazy this week messing around with a msd dis-4 right now.

 

[ozworldwide]

Hi our current WRC engines run at 11 to 1 compression ratio on 2 bar boost
runing WRF fuel witch is around 100 octain.

 

[drjonez]

yeah, comparing modern WRC engines to 25 yr old passenger car engines is a great idea....

 

[ozworldwide]

Sorry but an engine is a engine just some are more efficant as a std engine before serious mods.
Think its just a fancy air pump

 

[drjonez]

i disagree.

the other thing you're ignoring is engine management....